Question

Displacement time graph of a particle moving in a straight line is as shown in figure-$3.120$. Select the correct alternative(s) :

• A. Work done by all the forces in region $O A$ and $B C$ is positive.
• B. Work done by all the forces in region $A B$ is zero.
• C. Work done by all the forces in region $B C$ is negative.
• D. Work done by all the forces in region $O A$ is negative.

Answer 1

Answer: (B), (C)

In the region $A B$ the speed of particle is uniform hence no work is being done on the particle. In region $B C$ particle is retarding so work done by external forces on the particle is negative.